[Patrick]

The question. have you got all the plugins right?
if you are converting from 0.3e ---> 0.3x make sure you also update your includes and get the latest plugins

here's some tip https://sampforum.blast.hk/showthread.php?pid=2399507#pid2399507 to update your server

EDIT
If you really want to know what cause the problem you can also use Nativechecker Link: https://sampforum.blast.hk/showthread.php?tid=249226

I hope this will help you lot.